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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dfbc14b8be43564ae8dff0bc849e4a76047d11d757388dcdfb54080b00b73c' 
  AND token = '0qVwSFg/FXEGxq+vLUaNv03NE3yEo6FuC29Erv291Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}